CNBC's Sharon Epperson explains a 2025 tax tip on IRA contributions. Investors can contribute up to $7,000, or $8,000 if 50 or older, by April 15 and still count the contribution for the 2025 tax year. The limit applies across all IRAs combined. Traditional IRA contributions may be tax-deductible, while Roth IRA contributions are not. No specific securities or market trades are discussed.